MODIS Terra Surface Reflectance 8-Day L3 Global 250m
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keyword: NASA
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keyword: Reflectance
modified: 2026-07-29T00:00:00.000Z
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description: The MODIS Terra MOD09Q1 Version 6.1 product provides atmospherically corrected Surface Reflectance for MODIS Bands 1 and 2 at 250 m spatial resolution. The reflectance values are corrected for atmospheric effects including gases, aerosols, and Rayleigh scattering. The dataset is generated as an 8-day composite, where for each pixel the most suitable observation is selected from all acquisitions within the compositing period based on criteria such as cloud conditions and solar zenith angle. When multiple observations satisfy these criteria, the pixel with the lowest value in Band 3 (blue) is selected. The product also includes two quality assurance layers that provide information about data quality and observation conditions.
keyword: 250m
keyword: MOD09Q1
was generated by: Activity
  started at time: 2000-02-18T00:00:00.000Z
keyword: terra
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EARTH SCIENCE>CRYOSPHERE>SNOW/ICE>REFLECTANCE
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in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

EARTH SCIENCE>SPECTRAL/ENGINEERING>VISIBLE WAVELENGTHS
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in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

TERRA
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in scheme: https://earth.esa.int/concepts/concept_scheme/platforms
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CatalogRecord
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modified: 2026-07-29T01:04:59Z
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https://fedeo.ceos.org/collections/modis-terra-mod09q1
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conforms to: ISO19139-2

MODIS
type: Entity
in scheme: https://earth.esa.int/concepts/concept_scheme/instruments
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MODIS
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments

Terra
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in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/platforms

EARTH SCIENCE>LAND SURFACE>SURFACE RADIATIVE PROPERTIES>REFLECTANCE
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords